netdev - Re: SOCK_STREAM TCP: send() returns success even when other side responded with RST packet

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Message-ID: <20130219072608.7a3a473e@samsung-9>
Date:	Tue, 19 Feb 2013 07:26:08 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Tomas Hozza <thozza@...hat.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: SOCK_STREAM TCP: send() returns success even when other side
 responded with RST packet

> stack did not yet delivered the data.
> 
> I'm using TCP because it should guarantee that my data were delivered or
> let me know there was some problem. If this is not a bug, then it is at least
> confusing for TCP.
> 
> > To make sure data is delivered, you need additional logic.
> 
> To be honest I didn't find any way how to get notified there was a RST packet
> sent as a reply to my previously sent data.

TCP makes no end-to-end (application to application) guarantees.
Applications that need assurance need to do a request-reply at end of
transaction. You should get a good textbook like Stevens for more detail
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